Device for the reception and evaluation of telegraph signals



Aug. 12, 1958 G. w. KRATT DEVICE FOR THE RECEPTION AND EVALUATION OF TELEGRAPH SIGNALS Filed May 5, 1954 IN VE N TOR 6. W BY AGENT DEVICE FDRsTHE RECEPTION AND. EVALUATION OF TELEGRAPH'SIGNALS v Gerhard WilhelmvKratt, Pforzheim, .Germanyyassignor to International Standard Electric- ;Corporation, New

York, :N a corp afi nohD lawa Application May "3, 1954, Serial N 0. 427,313

Claims-zpriority,iapplication GermanyMay 5, 1953 6 Claims (Cl. 178-33) This invention relates to printing telegraphapparatus and.moreparticularlyto improvementsvin or relating to a receiver of .the single ,armatureetype. Devices are known which.receive;.and --evaluate telegraph signals in such'a, waythat-the signal corresponding to the received train of. impulses. can-be, recorded.- There are two known methods. which principally differ from each other thereby, .that-in thetoner-method a-receiving magnet, independently of theemployed telegraph code, has a single '7 ate :five armatur es.., In-an embodiment-of the first men-,-

tioned method, the position. of thearmature is explored successively. by means:-of so-calledswords which .are

caused to occupy one of two positions. -The position of theseg-swords is translated to a-receiving selector bar arrangement, which, thereupon releases, the corresponding, codebanwhichcauses ,a signal to be printed. .For this operation therezis required a relatively great number of componentspofa highprecision-standard,-.and it is essential,that-.theaquality of thematerial thereof be high,

especially the. so-calledf swordsr Aparttherefrom it is difliculhto adjust this-rsys'tema .1 Another. embodimentv of v the single-armature-system operates in such 'a way. that the ,positionsof the armature, is explored (scanned) by levers which, in oneposition of the armature,.are-led past thesarmature'and ,neednot, operate. In the other posi-. tion of the armature; they abut against. the armature, and

are used as limiting stops for a rotating shaft on which a v type-wheel-is mounted. In this arrangement, the levers are subjected to an unusual wear; Furthermore, singlee armature systems yareknown in which the position of the armature. isexploredby selecting leverswhich are each pivotedson acam leverm By the action of a spring,t hese selecting leverseach-act upon a selecting ring which, ac-

cording-,to the POSllZlOIlgOf the armature, will be either displaced or notdisplaced. ,The selecting lever arrange ment, accordingly, by the action of a spring, must per formathe operation: of the selectingring control. This requires an undesirablehigh speedoperationof the camcoupling adevice, and. .of the other. components involved in the selectingajirig ontrolu The; resultthereofis. a rela-.-

tively high,percentage. of wear. Besides .thenecessary closet-cooperation of thecomponents; requires .a high precisionamanufactureg. The multirarmature system likewise requires a great @numberof components of ahigh precision standard,- and the dependence of the..components upon, each other leadsto difiiculties in adjusting the system for.

operation.

The present invention ms ,to overcome the drawbacks 2,847,504 Patented Aug. 12, 1958 2 of the conventional arrangements. The expenditure of component parts is relativelylow, and the parts to be employed require no special standard precision, because their cooperation is in no case a critical one. 'Accordingly,

there :are also, required a fewrelatively simple'adjusb;

merits. None of thecomponent parts is subjected to excessive wearand teary The component partsvwhich are provided to perform the selection of the signal perform relatively simple functions, because their operations-mere:

1y have a preparatory effect, whereas the principal work for setting the corresponding signal. selectors is done by motor power.

The arrangement will now be particularly described with reference to the accompanying drawing, showing a preferred embodiment of the invention.

The,telegraph impulsesof the five-unit code assumed to be employed-in this example,,are received by the receivingmagnet.lhaving. acooperating armature 2 nor-,

mally pivoted, counterclockwise away from magnet 1 due to the actionof thetension spring 3.. The armaturehas an extension-arm 4 which cooperates with a cam disk 5 which urges the armature clockwise in proximity to magnet 1:at a predetermined time position of each signal impulse. Another extension arm 6 of the armature is providedwith a wide contacting .ortesting edge7 which is wide enough to cooperate with testing teeth-8 12 of the testing levers 13 17,:one tooth and testing lever being providedfor each element. The testing levers 13 17 are eachrsubject to the actionof its associated tension spring 18 22, and are each controlled by a ditferent. cam 23. 27, and each individually actvwith.theirvqcontactorendportionsa=28 32 upon an associated setting device 33; 37. These setting 7 devices 33 37 are eachtarrested by an associated ratchet lever- 38 42 in eitherof their two possible positions, which ratchet levers are normally urged against the devices 33 37 by reason of the action of an asso,

ciated tension spring..43 47. Springs 43 47 k normallyurge levers 38 42 in a clockwise direction.

Eachone of the setting devices 33 37 is opposed by a cooperating exploringvlever 48 52. These exploring levers48 52 .arepivoted at the upper end of a lever 53, which is normally urged by the tension spring 54-clockwise against the cam disk 55. ;.The said exploringlevers 48 52 are urged. at a certain predetermined time position against the setting devices I 33 37 whereby,uaccording to theirposition, they meet either the upper, setting arms 56 60 or the lowersetting arms 61 65., -By this operation, the exploring levers 48 52 are angularly turned, as indicated by the;arrows. This rotary movement is transferred to the-ring-type selecting .bars66 70, whereby common-lever76 to either actuate the perforating punches 77 81, it moved to the right and in a position beneath the punches or not. The restoring lever 82 is subject to the actionrof the-tension spring 83 which normally urgesdit clockwise into cooperation with. the .cam 84, and

serves the ,function of restoring the setting devices 33 37 to normal position after the selection of the signals. v

Two examples will demonstrate the operation of the devices: First it is assumed that a start or no-current signal impulse is received. The start impulse causes the armature 2 to drop off the receiving magnet 1, whereby the receiving shaft 85 will be started in the conventional manner. The first cam of the cam disk will press the armature 2 via its extension 4 clockwise against the receiving magnet 1, but the armature will drop off again because the signal impulse is a currentless one. On account of this the testing edge 7 will be positioned in engagement with the testing tooth 8 of the testing lever 13, so that the testing lever 13 with its contactor portion 28 is then capable of pivoting clockwise about its lower end thereby causing its associated setting device 33 to partially rotate counterclockwise as the cam 23 rotates against the cam follower surface of lever 13 since the lower end of the lever 13 is retained by the engagement of the testing edge 7 with the tooth 8. The setting device 33 is thus moved into its second position against stop 89 in which its setting arm 56 now opposes the upper arm of its associated exploring lever 48. After the reception of all the signal impulses of a code combination the cam 55 will actuate the lever 53, which urges the upper arm of the exploring lever 48 against the setting arm 56, so that the exploring lever 48 will be caused to perform a clockwise rotary movement, thus rotating the ring-type selecting bar 66 counterclockwise into another position limited by the stops 66a which define limits of operation thereof. Shortly after, the exploring lever 48 is withdrawn from the setting arm 56 and the restoring lever 82 is actuated counterclockwise by the cam 84, whereby the setting device 33 will be rotated clockwise and restored to its first stop position.

In the second example it will be assumed that a mark or current signal impulse is received.

The start or space signal, in the manner described above, causes the shaft 85 to start rotation and the first cam of the cam disk 5 urges the armature 2 against the receiving magnet 1 by reason of the clockwise movement of extension 4 as it rides on the said cam surface. Since the next impulse will be a mark or current-carrying one, the armature 2 will remain attracted, whereby the testing edge 7 will be disengaged from the testing tooth 8. When now the cam 23 rides over the testing lever 13, the latter will find no pivot support at its testing tooth 8 upon which to pivot in a clockwise direction. However, the lever will find a counter support at its upper end by means of its contactor portion 28 resting against a depending arm on the setting device 33, so that the testing lever 13 Will pivot about 28 in a counterclockwise direction against the tension of its spring 18, but without moving the setting device 33. This movement of the lever 13 is possible on account of the engagement of the bearing pin 86 in a slot at the lower end of lever 13. The spring 18 will restore the lever 13 to normal when the cam 23 passes the camming surface on lever 13, so as to be ready for selecting the next succeeding signal. Hence the setting device 33 will remain in the position shown. As described in the first example, the exploring lever 48 performs a testing of the position of the setting device 33 and will, accordingly, in this case engage the lower arm 61 of the setting device 33, thereby actuating the selecting ring 66 to the position shown in the drawing. The restoring lever 82 will now perform its counterclockwise movement, but does not actuate the setting device 33 because it has not changed its position. The limiting stops 87 and 89 serve to prevent any rotary movement of the setting devices 33 37 when being explored by the exploring levers 48 52, so that the ratchet levers 38 42 need only retain the setting devices in either of their two operable positions. The limiting stop 88 prevents the testing levers 13 17 and the restoring lever 82 from following the trough portion of their respective cams.

It will be understood that if a seven unit code is to be used, there will be required seven testing levers, and a 4, like number of cams, setting devices, exploring devices, selector bars, etc.

While I have described above the principles of my invention in connection with specific apparatus, it is to be clearly understood that this description is made only by Way of example and not as a limitation to the scope of my invention as set forth in the objects thereof and in the accompanying claims.

What is claimed is:

1. In a start-stop teleprinter receiver a rotatable control shaft, a receiver magnet, an armature for said electromagnet, means under control of said shaft for periodically moving said armature in proximity to said magnet independent of the nature of the received signal, a plurality of cams coupled to said shaft, a plurality of testing levers, one for each element of the telegraph code to be received, each adapted to cooperate with a different one of said cams, a plurality rockable setting devices, each adapted to be rocked from a first position to a second position by a different one of said testing levers, a plurality of exploring levers each associated with a difierent one of said setting devices, a plurality of selector means, each associated with a different one of said exploring levers, common means under control of another one of said cams for periodically moving each of said exploring levers against its associated setting device, each of said exploring levers adapted to be set in one of two angular positions dependent upon the rocked position of its associated setting device, each of said selector means adapted to be set in either of two angular positions upon movement of said common means, means under control of another one of said cams for restoring each of said setting devices from its second position to its first position after said common means has moved said exploring levers, and detent means coupled to said armature for selectively rendering the motion imparted to said testing levers by their associated cams eifective or ineffective to rock said setting devices from their first position to their second position dependent upon the respective state of deenergization or energization of said magnet.

2. In a start-stop teleprinter receiver as claimed in claim 1 wherein said selector means comprise a plurality of ring type selector bars, said bars adapted to be angulary rotated under control of said exploring levers.

3. In a start-stop teleprinter receiver as claimed in claim 1, further comprising means for retaining each of said setting devices in either of their two cooperative positions when not cooperating with their associated testing levers.

4. In a start-stop teleprinter receiver as claimed in claim 1, further comprising a single stop against which said restoring means and said testing levers are adapted to abut when not being actuated by their respective associated cams.

5. In a start-stop teleprinter receiver as claimed in claim 1, wherein each of said testing levers comprises a pivot, an arcuate shaped member having a cam following surface on the inside of its arc, a first pivoting portion adjacent a first end of said member and a second pivoting portion at the opposite end of said member, spring means adapted to normally urge said member against said pivot, and a latch surface at the first end of said member adapted to cooperate with said means coupled to said armature for selectively rendering inefiective the motion imparted to said members by said cams.

6. In a start-stop teleprinter as claimed in claim 3, wherein each of said setting devices comprises a multitoothed member, one of said testing levers and said restoring means adapted to be interposed between a first pair of said teeth, a second pair of said teeth, of which each tooth is adapted to co-act with a difierent portion of an exploring lever, and a plurality of additional teeth, said additional teeth adapted to cooperate with said retaining means.

(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Wusteney Apr. 14, 1931 Krum July 11, 1933 Zenner Apr. 15, 1941 Salmon et a1. July 29, 1952 Wusteney Sept. 9, 1952 6 Kleinschmjdt Sept. 14, 1954 Wusteney Feb. 21, 1956 Kleinschmidt July 10, 1956 Kleinschmidt et a1. Dec. 11,1956

FOREIGN PATENTS France Jan. 8, 1945 Germany July 4, 1940 

